executor, planner: fix some cases for natural_using_join (#20977)#21021

Merged

ti-srebot merged 3 commits intopingcap:release-4.0from ti-srebot:release-4.0-c8545947a11d

Nov 17, 2020

+163-46

Commits on Nov 12, 2020

cherry pick pingcap#20977 to release-4.0

XuHuaiyu
authored and
ti-srebot
committed

Commits on Nov 17, 2020